These dungeons are designed to be completed in AF1, according to the devs. They're the same difficulty as WP, if not easier. They're meant to offer more variety for the WP/AK level of farming. 5 dungeons to farm phil/myth, instead of 2. I'm tired of WP/AK, but I still farm them for myth/phil, so farming these new dungeons instead will be refreshing.
Also, i70 gear isn't needed for CT, as they've said CT is designed to be completed by players in i55 (WP, less than the new dungeons) level of gear. So these new dungeons can be a stepping stone for newer players to get into CT, and then CT awards i80 gear.